Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d747f583f5b4924…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 04:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e91f2d338c6f98ae20dfac462ece332c SHA-1: 8f5114d8ca7cfdac066e1fe2ab97446f35324b65 SHA-256: 9d747f583f5b4924f8377423613e7a62acba0ad92feb1e0091756d1622361211
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identifies it as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://scalping.ir/data/files/file/72820624986.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/35927179247.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/nazamizobikepixi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/12376477967.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/24162305773.pdfIn PDF document text
    • http://livestocktool.com/d/files/40039931043.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/wajajagonasup.pdfIn PDF document text
    • https://lapakunited.com/contents/files/30402602724.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hpkcahh86tmcr6fqdasqstpn7i/luruzemekifunor.pdfIn PDF document text
    • http://saydersan.com/firma/files/20143295459.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h5i32625cq5vsvfo0h9leo874l/jorafefizagosi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/potafitedesus.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/89921280521.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/81724964300.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_094546.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/10850670013.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/6437579649.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/dofijazakalogilepojesuju.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/1912146911.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11703846194.pdfIn PDF document text
    • http://klenderbio.com/upload/files/65709555568.pdfIn PDF document text
    • http://fpole.ru/sadm_files/visapo.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/lewusunurovukekika.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/mojumilowexojoduwowesogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=app+store+cracked+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 17284 bytes
SHA-256: 62c2badd3f490945566900b59613c0d18f147756e1e8f2b6faea7f5cba3f18c9
font_01_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 10532 bytes
SHA-256: 075eada2bc4fc3f19bc8ae02d9fd7be8edd1f35e320edb9fa262c7ac29299921